KR20030083294A - a method for interlock shock controling at manual D →N of automatic transmission in vehicle - Google Patents

Abstract

PURPOSE: A shift control method in shifting into the neutral range in an automatic transmission during forward travel of a vehicle is provided to prevent interlock shock in shifting from the D-range to the N-range by supplying hydraulic pressure to a brake according to travel condition. CONSTITUTION: Switching condition of a shift lever and rpm of an output shaft are detected in shifting the shift lever during traveling forward(S110). A release control signal of forward and neutral operation factors is output in shifting from the D-range into the N-range in case of rpm of the output shaft to be over the first predetermined value, and the rpm of the output shaft and the position of the shift lever are decided(S130). The opening degree of a throttle valve and the power condition are decided in case of the output shaft rpm to be less than the first predetermined value in shifting from the D-range into the N-range(S140,S150). The neutral operation factor combination signal is output at power-off in case of the opening degree of the throttle valve to be zero(S160).

Description

Shift control method during neutral shift during forward driving of a vehicle automatic transmission {a method for interlock shock controling at manual D → N of automatic transmission in vehicle}

The present invention relates to an automatic transmission for a vehicle, and more particularly, shift control during forward switching of an automatic transmission for a vehicle for preventing an interlock shock generated when the shift lever D → N is changed in a vehicle in which the vehicle is moving forward. It is about a method.

An automatic transmission for a vehicle is provided with a shift control device that automatically adjusts a transmission ratio according to a vehicle traveling speed and a load.

The shift control device performs a shift by controlling a plurality of clutches and brakes installed in the gear train in an activated or inoperative state to adjust the output rotation speed of the planetary gear device.

As shown in FIG. 1, the automatic transmission operated as described above is operated in the neutral (N), parking (P) range with hydraulic pressure applied to the first brake (B1: L / RB) and the fourth clutch (C4: CST / C). The hydraulic pressure is supplied to the third clutch C3 (REV / C), the first brakes B1: L / RB, and the fourth clutch C4: CST / C in the reverse R range.

In the first forward speed D1, hydraulic pressure is supplied to the first clutch C1: FWD / C, and the first one-way clutch OWC1 and the second one-way clutch OWC2 operate.

In the second forward speed D2, hydraulic pressure is supplied to the first clutch C1: FWD / C, the second brake B2: 2-4 / B, and the fourth clutch C4: CST / C. The way clutch OWC2 is activated.

At 3rd forward speed D3, hydraulic pressure is supplied to the first clutch C1: FWD / C, the second clutch C2: 3-4 / C, and the fourth clutch C4: CST / C. The way clutch OWC2 is activated.

At 4th forward speed, hydraulic pressure is supplied to the first clutch C1: FWD / C, the second clutch C2: 3-4 / C, and the second brake B2: 2-4 / B to operate as an operating element.

As described above, when the shift lever of the vehicle being driven is shifted from the forward (D) range to the neutral (N) range in the automatic transmission operated by supplying the hydraulic pressure, the first brake is operated while the power train is rotating. Hydraulic pressure is supplied to (L / RB).

That is, as shown in FIG. 2, in the forward 1 speed D1 state, the first one-way clutch OWC1 operates to restrain the rear carrier from turning to create the 1 speed state, but in the forward 2, 3, and 4 states. According to the operating conditions, the rear carrier RC1 starts to rotate, and ascends to the speed corresponding to each shift stage and the input engine torque.

Here, similarly, the first brakes B1 (L / R B) installed to enable the engine brake in the forward 1 speed D1 state also have a function of restraining the rear carrier RC1 from turning according to the operating conditions.

At this time, when the driver switches the shift lever from the forward (D) range to the neutral (N) range, as shown in FIG. 1, the rear carrier rotates while the hydraulic pressure is supplied to the first brake B1: L / RB. The rotation is constrained so as not to turn RC1, and at this time, there is a problem that excessive shock occurs due to interlock.

Accordingly, an object of the present invention is to solve the above problems, and when the D → N range switching is performed by the shift lever switching of the driver in the automatic transmission vehicle traveling in the forward (D) range, the driving condition of the vehicle is determined. Accordingly, the present invention provides a shift control method during neutral switching during forward driving of an automatic transmission for a vehicle for supplying hydraulic pressure to a first brake B1 (L / RB) when a shift shock is not generated.

1 is a table showing the operating elements for each shift stage of the vehicle automatic transmission,

2 is a power train diagram of an automatic transmission for a vehicle,

3 is a block diagram of a shift control apparatus at the time of neutral switching during the forward driving of the vehicle automatic transmission according to the present invention;

4 is a flowchart illustrating a shift shock control method of an automatic transmission for a vehicle applied to the present invention.

<Description of Symbols for Main Parts of Drawings>

100: vehicle operation state detection device 110: throttle valve opening detection unit

120: output shaft rotation speed detection unit 130: input shaft rotation speed detection unit

140: engine speed detection unit 150: oil temperature detection unit

160: shift lever position detection unit 200: shift control device

300: drive device

The present invention for achieving the above object,

Determining the shift lever switching condition and the output shaft rotation speed when the shift lever switching is performed in the vehicle driving forward;

In the step, when it is determined that the shift lever D to N switching is performed at the output shaft rotation speed greater than or equal to the first predetermined value, the forward shifting operation element and the neutral operating element release control signal are output, and the output shaft rotation speed and the shift lever position are determined. Making a step;

Determining the throttle valve opening degree and the power condition when the output shaft rotational speed is less than or equal to the first predetermined value when the shift lever D → N is switched in the above step;

In this step, if the throttle valve opening degree is 0% and the power-off state, the neutral operating element coupling control signal is characterized in that it comprises a step.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a table showing the operating elements for each shift stage of the automatic transmission for a vehicle, Figure 2 is a power train diagram of the automatic transmission for a vehicle, Figure 3 is a configuration of a shift control apparatus during the neutral shift during the forward driving of the automatic transmission for a vehicle according to the present invention 4 is a block diagram illustrating a method of controlling a shift impact control method of an automatic transmission for a vehicle according to the present invention.

As shown in FIG. 1, as the shifting stage-specific actuation element of the vehicle automatic transmission, the first clutch C1 and the fourth clutch C4 operate as the actuation element at the forward D range 1 speed, and the first one-way clutch OWC1. And second one-way clutch OWC2 operate simultaneously.

In the forward D range 2 speed, the first clutch C1, the fourth clutch C4, and the second brake B2 operate as operating elements, and the second one-way clutch OWC2 operates.

In the forward D range third speed, the first clutch C1, the second clutch C2, and the fourth clutch C4 operate as operating elements, and the second one-way clutch OWC2 operates.

In the forward D range 4 speed, the first clutch C1, the second clutch C2, and the second brake B2 operate as operating elements, and the first and second one-way clutches OWC1 and 2 do not operate. .

In the neutral N range and parking P range, the fourth clutch C4 and the first brake B1 operate as missing elements, and in the reverse R range, the third clutch C3 and the fourth clutch C4 and the first brake ( B1) acts as the operating element.

As shown in FIG. 3, the shift control apparatus at the time of neutral switching during the forward driving of the automatic transmission for a vehicle according to the present invention includes a throttle valve opening, an output shaft rotation speed, an input shaft rotation speed, an engine rotation speed, and an oil temperature that vary according to a change in an operation state of the vehicle. And a vehicle operation state detection device 100 for detecting a change in the position of the shift lever.

When the driver shifts the shift lever while driving forward by receiving the throttle valve opening degree, the output shaft rotation speed, the input shaft rotation speed, the engine rotation speed, the oil temperature, and the shift lever position change detected by the vehicle operation state detection device 100. When the shift lever is in the state of D → N switching and the vehicle speed is greater than or equal to the predetermined first setting value, the shift lever switching state and the neutral operating element are released, and then the shift lever is released. The shift control device outputs a neutral control element coupling control signal according to the opening of the throttle valve and the power state when it is determined that the shift lever is positioned at the N range by re-determining the position and the traveling vehicle speed and the driving vehicle speed is less than or equal to the first set value. 200;

The driving device 300 is configured to release the forward shifting operation element of the vehicle running forward in synchronization with a predetermined control signal output from the shift control device 200 and supply hydraulic pressure to couple the neutral operation element.

The vehicle operation state detection apparatus 100 includes a throttle valve opening degree detection unit 110 for detecting a throttle valve opening in association with an accelerator pedal operation state of a driver;

An output shaft rotation speed detection unit 120 for detecting a change in output shaft rotation speed corresponding to a vehicle speed that is changed according to a change in an operation state of the vehicle;

An input shaft rotation speed detection unit 130 that detects a change in the input shaft rotation speed that varies according to a change in an operation state of the vehicle;

An engine speed detector 140 for detecting a change in engine speed that varies according to a vehicle operating state change;

An oil temperature detector 150 which detects a change in oil temperature that varies according to a change in an operation state of the vehicle;

The shift lever position detector 160 detects a shift lever position change that is variable according to the shift lever switching of the driver.

With reference to Figs. 1, 2 and 4 attached to the shift control method during the neutral switching during the forward driving of the vehicle automatic transmission having the above configuration by way of example will be described.

In a vehicle traveling in the forward D-range 3 speed, the shift control apparatus 200 may detect the opening of the throttle valve, the output shaft rotation speed, the input shaft rotation speed, the engine rotation speed, the oil temperature, and the shift lever position detected by the vehicle operation state detection device 100. Outputs a predetermined control signal to receive the input (S100).

The vehicle operation state detecting apparatus 100 receives a control signal applied from the shift control apparatus 200 to detect a throttle valve opening degree, an output shaft rotation speed, an input shaft rotation speed, an engine rotation speed, an oil temperature, and a shift lever position change. When outputting, the shift control apparatus 200 receives a throttle valve opening degree, an output shaft rotation speed, an input shaft rotation speed, an engine rotation speed, an oil temperature, and a shift lever position change applied by the vehicle operation state detection device 100. By shifting the shift lever, it is determined whether the shift lever position is the N range, and whether the output shaft rotation speed No corresponding to the vehicle speed is equal to or greater than a first predetermined value (eg, 150 rpm) (S110).

As shown in FIG. 1, the first clutch C1, the second clutch C2, and the fourth clutch C4 operate as the operating elements, and the second one-way clutch ( OWC2) works.

Therefore, the power output from the engine (not shown) is applied to the input shaft via a torque converter (not shown) as shown in FIG. 2, and the first sun gear of the first planetary gear set u1 is applied by the first clutch C1. S1 and the second clutch C2 are transmitted to the second carrier rc2 of the second planetary gear set u2.

In this case, the second carrier rc2 of the second planetary gear set u2 is connected to the first ring gear r1 of the first planetary gear set u1 by the fourth clutch C4 and thus the first carrier gear rc2 is connected to the first ring gear r1 of the first planetary gear set u1. As the ring gear r1 also rotates in the same direction as the first sun gear s1, the third vehicle speed is output from the first carrier fc1 to the unnurnus gear a so that the daughter vehicle runs at three speeds. .

If the driver switches the shift lever from D to N while driving the forward D range, and the shift lever is located in the N range and the output shaft speed No is determined to be equal to or greater than a predetermined first set value (eg, 150 rpm), the shift lever The device 200 outputs a predetermined duty control signal for releasing the forward D range operating element and the neutral N range operating element.

Accordingly, as shown in FIG. 2, the first clutch C1, the second clutch C2, and the third clutch C4 are released by the control signal output from the shift control apparatus 200 so that the power train is neutral. In this state, the power train continues to rotate due to the traveling vehicle speed.

However, the fourth clutch C4 engaging the second carrier rc2 and the first ring gear r1 does not completely release the hydraulic pressure, so that the first planetary gear set u1 and the second planetary gear set are not released. u2 continues to rotate integrally.

At this time, when the hydraulic pressure is supplied to the first brake B1 to operate as an operating element, the power train rotated by the driving inertia is damaged or severe interlock shock occurs at the low driving inertia.

Accordingly, in order to prevent damage to the power train rotating by the driving inertia as described above, the shift control apparatus 200 has the shift lever position at the neutral N range, and the output shaft speed No corresponding to the vehicle speed is zero. It is determined whether or not a set value (eg, 150 rpm) is 1 or less (S130).

In the above, when it is determined that the shift lever position is located in the neutral N range and the output shaft speed No corresponding to the vehicle speed is equal to or less than the first set value (eg, 150 rpm), the shift control apparatus 200 operates the driver's accelerator pedal. In order to determine the state, it is determined whether the throttle valve opening degree is 0% (S140).

When it is determined that the throttle valve opening degree without the driver's accelerator pedal operation is 0%, the shift control apparatus 200 determines the power determined by the engine speed compared to the throttle valve opening degree in preparation for the D → N → D switching of the shift lever. The state is determined (S150).

When it is determined in the above that the power state determined by the engine speed relative to the throttle valve opening degree is the power-off state, the shift control apparatus 200 may determine that the output shaft speed due to the inertia of the vehicle is equal to or less than the first set value (eg, 150 rpm). If it is determined that the deterioration, it is determined that the hydraulic pressure of the fourth clutch (C4) is completely released, and outputs a predetermined neutral coupled duty control signal for operating the first brake (B1) as an operating element (S160).

In addition, when it is determined that the shift lever position is the neutral N range in S110 and the output shaft rotation speed is equal to or less than the first set value (eg, 150 rpm), the shift control apparatus 200 immediately operates the first brake B1. The step S160 of outputting a predetermined neutral combined duty control signal for operating with

Thus, when it is determined that the switching from the forward D range to the neutral N range by the driver's shift lever operation during three-speed driving, the neutral N range is operated by accurately determining the output shaft rotation speed (No), the throttle valve opening, and the power state of the transmission. By outputting the element coupling control signal, it is possible to prevent the occurrence of an interlock shock caused by the driver's shift lever D → N operation.

As described above, according to the present invention, when the D → N range is changed by the shift lever switching of the driver in the automatic transmission vehicle traveling in the forward (D) range, the timing at which the shift shock is not generated by determining the driving condition of the vehicle is determined. By supplying hydraulic pressure to the first brakes B1 (L / RB), it is possible to prevent the occurrence of an interlock shock due to the shift lever D → N operation of the driver while driving.

Claims (2)

Determining the shift lever switching condition and the output shaft rotation speed when the shift lever switching is performed in the vehicle driving forward; In the step, when it is determined that the shift lever D to N switching is performed at the output shaft rotation speed greater than or equal to the first predetermined value, the forward shifting operation element and the neutral operating element release control signal are output, and the output shaft rotation speed and the shift lever position are determined. Making a step; Determining the throttle valve opening degree and the power condition when the output shaft rotational speed is less than or equal to the first predetermined value when the shift lever D → N is switched in the above step; In the step, the throttle valve opening degree is 0%, if the power-off state, the shift impact control method of the automatic transmission for a vehicle, characterized in that it comprises the step of outputting a neutral control element coupling control signal. The method of claim 1, wherein the first set value is 150rpm.